By Jay / / Games

Update 21 has officially launched in Spongebob Tower Defense, bringing a ton of exciting new features for players to dive into. Whether you’re here to learn about the new boss battles, collect powerful units, or grab the latest codes, this guide has everything you need to know.

All Things Coming to Spongebob Tower Defense Update 21

Boss Battles Are Now Live!

One of the biggest highlights in Update 21 is the introduction of Boss Battles. You can now enter the Chum Coliseum and test your team’s strength against 16 deadly bosses. Each boss offers a unique challenge, pushing your strategies to the limit.

  • Exclusive Rewards: Defeating bosses rewards you with rare and exclusive items. Make sure your team is well-prepared before jumping in.
  • Drop Rates Improve: The drop rates for new units improve based on which boss you are fighting. Higher-level bosses increase your chances of getting the rarest units.

New Units, Mounts & Food to Collect

Update 21 adds several powerful new units and mounts to boost your gameplay:

  • Mythic Gladiator Patrick: This new mythic unit is a game-changer. Gladiator Patrick offers strong attack and defense capabilities, making him a valuable addition to any team.
  • Limited Lion Fish Units: These are limited-time units that bring unique skills and strengths. Don’t miss out on adding these to your collection.
  • New Mounts: The update includes the limited Chariot Mount, available in the Mount Shop. Mounts provide additional stats and bonuses, so grab them while you can.
  • New Unit Food: Boost your units’ power with the newly introduced unit food items.

Achievements and Secret Rewards

For players who love completing challenges, Update 21 introduces new achievements under the “Coliseum Clash” category.

  • Complete all Coliseum Clash achievements and earn the Secret Lion Fish Mount.
  • These achievements encourage players to participate in boss battles and test their skills thoroughly.

Double Player XP Weekend

To celebrate the update, the game is running a 2x Player XP Weekend.

  • Earn double the player XP until Monday at 11:59 PM CT.
  • Use this weekend to level up faster, unlock new skills, and improve your gameplay efficiency.

Spongebob Tower Defense Update 21 Codes!

A new code has been released to help players deal with the update delay.

  • GrowASponge

Redeem this code in-game for rewards that will aid your progress.


Update 21 in Spongebob Tower Defense introduces fresh challenges and rewards that make the game more thrilling than ever. With boss battles, powerful new units, exclusive mounts, and event bonuses, there’s plenty to keep both new and veteran players engaged. Make sure to use the new code, push through the Coliseum, and claim those secret rewards!

SpongeBob Tower Defense
About Jay
A Content writer for Roonby.com Contact me on [email protected], we can't reply to gmail for some reason.